extragonadal germ cell tumors

Definition of extragonadal germ cell tumor
National Cancer Institute

extragonadal germ cell tumor

(EK-struh-goh-NA-dul jerm sel TOO-mer)
A rare cancer that develops in germ cells that are found in areas of the body other than the ovary or testicle (such as the brain, chest, abdomen, or tailbone). Germ cells are reproductive cells that develop into sperm in males and eggs in females.

Source: NCI Dictionary of Cancer Terms